P0421 Code

15 Dec 2023

Solving the p0421 code: catalyst efficiency below threshold P0421 – warm up catalytic converter bank 1 efficiency below threshold Fehlercode p0421 mitsubishi / i have a 02 lancer have code po421 the

P0421 Code Meaning, Symptoms, Causes & Fixing

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P0421 code: warm up catalyst efficiency below threshold (bank 1)

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